:root {
  --bg: #050505;
  --card: #2b2b2b;
  --text: #f1f1f1;
  --muted: #ffffff;
  --player-fullscreen-backdrop: #000000;
  --primary: #8ab4ff;
  --primary-soft: #3a3a3a;
  --border: #454545;
  --shadow: 0 16px 40px rgba(0, 0, 0, 0.38);
  --radius: 18px;
  --max: 1180px;
  --font-serif: "Minion Pro", "Adobe Garamond Pro", Garamond, "Baskerville Old Face", Cambria, "Times New Roman", serif;
  --lesson-title-size: 1rem;
  --lesson-title-line-height: 1.4;
  --lesson-title-weight: 400;
}
html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 20px;
  line-height: 1.45;
  min-height: 100vh;
  position: relative;
  background-color: var(--bg);
  background-image:
    radial-gradient(circle at 12% 18%, rgba(255,255,255,0.85) 0 1px, transparent 1.6px),
    radial-gradient(circle at 24% 72%, rgba(255,255,255,0.5) 0 1px, transparent 1.7px),
    radial-gradient(circle at 38% 26%, rgba(255,255,255,0.55) 0 1px, transparent 1.8px),
    radial-gradient(circle at 52% 64%, rgba(255,255,255,0.7) 0 1px, transparent 1.6px),
    radial-gradient(circle at 67% 14%, rgba(255,255,255,0.45) 0 1px, transparent 1.7px),
    radial-gradient(circle at 79% 48%, rgba(255,255,255,0.6) 0 1px, transparent 1.8px),
    radial-gradient(circle at 91% 22%, rgba(255,255,255,0.8) 0 1px, transparent 1.6px),
    radial-gradient(circle at 86% 78%, rgba(255,255,255,0.5) 0 1px, transparent 1.9px),
    radial-gradient(circle at 8% 88%, rgba(255,255,255,0.65) 0 1px, transparent 1.8px),
    radial-gradient(circle at 58% 88%, rgba(255,255,255,0.4) 0 1px, transparent 1.7px),
    radial-gradient(circle at 4% 30%, rgba(255,255,255,0.42) 0 0.9px, transparent 1.6px),
    radial-gradient(circle at 10% 56%, rgba(255,255,255,0.52) 0 0.95px, transparent 1.7px),
    radial-gradient(circle at 18% 8%, rgba(255,255,255,0.36) 0 0.9px, transparent 1.6px),
    radial-gradient(circle at 27% 44%, rgba(255,255,255,0.5) 0 0.95px, transparent 1.7px),
    radial-gradient(circle at 33% 82%, rgba(255,255,255,0.4) 0 0.9px, transparent 1.6px),
    radial-gradient(circle at 41% 12%, rgba(255,255,255,0.48) 0 0.95px, transparent 1.7px),
    radial-gradient(circle at 47% 54%, rgba(255,255,255,0.38) 0 0.9px, transparent 1.6px),
    radial-gradient(circle at 55% 34%, rgba(255,255,255,0.46) 0 0.95px, transparent 1.7px),
    radial-gradient(circle at 63% 72%, rgba(255,255,255,0.42) 0 0.9px, transparent 1.6px),
    radial-gradient(circle at 71% 6%, rgba(255,255,255,0.5) 0 0.95px, transparent 1.7px),
    radial-gradient(circle at 76% 84%, rgba(255,255,255,0.34) 0 0.85px, transparent 1.5px),
    radial-gradient(circle at 83% 40%, rgba(255,255,255,0.44) 0 0.95px, transparent 1.7px),
    radial-gradient(circle at 89% 60%, rgba(255,255,255,0.38) 0 0.9px, transparent 1.6px),
    radial-gradient(circle at 96% 10%, rgba(255,255,255,0.46) 0 0.95px, transparent 1.7px),
    radial-gradient(circle at 94% 90%, rgba(255,255,255,0.34) 0 0.85px, transparent 1.5px);
  color: var(--text);
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.92;
  background-image:
    radial-gradient(circle at 6% 12%, rgba(255,255,255,0.95) 0 1.2px, transparent 2.1px),
    radial-gradient(circle at 16% 34%, rgba(255,255,255,0.55) 0 1px, transparent 1.8px),
    radial-gradient(circle at 22% 62%, rgba(255,255,255,0.7) 0 1.1px, transparent 2px),
    radial-gradient(circle at 28% 84%, rgba(255,255,255,0.5) 0 1px, transparent 1.9px),
    radial-gradient(circle at 35% 18%, rgba(255,255,255,0.6) 0 1.1px, transparent 1.9px),
    radial-gradient(circle at 44% 42%, rgba(255,255,255,0.9) 0 1.25px, transparent 2.1px),
    radial-gradient(circle at 53% 76%, rgba(255,255,255,0.58) 0 1px, transparent 1.8px),
    radial-gradient(circle at 61% 26%, rgba(255,255,255,0.72) 0 1.15px, transparent 2px),
    radial-gradient(circle at 69% 58%, rgba(255,255,255,0.55) 0 1px, transparent 1.9px),
    radial-gradient(circle at 74% 10%, rgba(255,255,255,0.85) 0 1.2px, transparent 2px),
    radial-gradient(circle at 81% 37%, rgba(255,255,255,0.52) 0 1px, transparent 1.9px),
    radial-gradient(circle at 88% 68%, rgba(255,255,255,0.68) 0 1.1px, transparent 1.9px),
    radial-gradient(circle at 95% 21%, rgba(255,255,255,0.92) 0 1.25px, transparent 2.1px),
    radial-gradient(circle at 12% 93%, rgba(255,255,255,0.6) 0 1px, transparent 1.9px),
    radial-gradient(circle at 48% 92%, rgba(255,255,255,0.75) 0 1.1px, transparent 1.9px),
    radial-gradient(circle at 78% 88%, rgba(255,255,255,0.5) 0 1px, transparent 1.8px),
    radial-gradient(circle at 14% 20%, rgba(255,255,255,0.98) 0 1.7px, rgba(255,255,255,0.2) 2.4px, transparent 6px),
    radial-gradient(circle at 72% 31%, rgba(255,255,255,0.92) 0 1.6px, rgba(255,255,255,0.18) 2.2px, transparent 5.6px),
    radial-gradient(circle at 84% 74%, rgba(255,255,255,0.88) 0 1.5px, rgba(255,255,255,0.16) 2px, transparent 5.2px);
  background-repeat: no-repeat;
  background-size:
    auto, auto, auto, auto, auto, auto, auto, auto,
    auto, auto, auto, auto, auto, auto, auto, auto,
    18px 18px, 16px 16px, 15px 15px;
  background-position:
    0 0, 0 0, 0 0, 0 0, 0 0, 0 0, 0 0, 0 0,
    0 0, 0 0, 0 0, 0 0, 0 0, 0 0, 0 0, 0 0,
    14% 20%, 72% 31%, 84% 74%;
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.9;
  background-image:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 120 120'%3E%3Ccircle cx='60' cy='60' r='4.4' fill='%23ffffff' fill-opacity='0.96'/%3E%3Cline x1='60' y1='12' x2='60' y2='108' stroke='%23ffffff' stroke-opacity='0.72' stroke-width='2.1' stroke-linecap='round'/%3E%3Cline x1='16' y1='60' x2='104' y2='60' stroke='%23ffffff' stroke-opacity='0.42' stroke-width='1.6' stroke-linecap='round'/%3E%3Cline x1='33' y1='33' x2='87' y2='87' stroke='%23ffffff' stroke-opacity='0.18' stroke-width='1.1' stroke-linecap='round'/%3E%3Cline x1='37' y1='83' x2='83' y2='37' stroke='%23ffffff' stroke-opacity='0.12' stroke-width='0.9' stroke-linecap='round'/%3E%3C/svg%3E"),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 120 120'%3E%3Ccircle cx='60' cy='60' r='4' fill='%23ffffff' fill-opacity='0.92'/%3E%3Cline x1='60' y1='14' x2='60' y2='106' stroke='%23ffffff' stroke-opacity='0.62' stroke-width='1.9' stroke-linecap='round'/%3E%3Cline x1='20' y1='60' x2='100' y2='60' stroke='%23ffffff' stroke-opacity='0.34' stroke-width='1.3' stroke-linecap='round'/%3E%3Cline x1='38' y1='38' x2='82' y2='82' stroke='%23ffffff' stroke-opacity='0.12' stroke-width='0.9' stroke-linecap='round'/%3E%3C/svg%3E"),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 120 120'%3E%3Ccircle cx='60' cy='60' r='3.7' fill='%23ffffff' fill-opacity='0.88'/%3E%3Cline x1='60' y1='18' x2='60' y2='102' stroke='%23ffffff' stroke-opacity='0.56' stroke-width='1.7' stroke-linecap='round'/%3E%3Cline x1='24' y1='60' x2='96' y2='60' stroke='%23ffffff' stroke-opacity='0.28' stroke-width='1.1' stroke-linecap='round'/%3E%3Cline x1='40' y1='80' x2='80' y2='40' stroke='%23ffffff' stroke-opacity='0.1' stroke-width='0.8' stroke-linecap='round'/%3E%3C/svg%3E"),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 120 120'%3E%3Ccircle cx='60' cy='60' r='4.2' fill='%23ffffff' fill-opacity='0.94'/%3E%3Cline x1='60' y1='10' x2='60' y2='110' stroke='%23ffffff' stroke-opacity='0.68' stroke-width='2' stroke-linecap='round'/%3E%3Cline x1='18' y1='60' x2='102' y2='60' stroke='%23ffffff' stroke-opacity='0.36' stroke-width='1.4' stroke-linecap='round'/%3E%3Cline x1='35' y1='35' x2='85' y2='85' stroke='%23ffffff' stroke-opacity='0.14' stroke-width='1' stroke-linecap='round'/%3E%3C/svg%3E"),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 120 120'%3E%3Ccircle cx='60' cy='60' r='3.9' fill='%23ffffff' fill-opacity='0.9'/%3E%3Cline x1='60' y1='16' x2='60' y2='104' stroke='%23ffffff' stroke-opacity='0.58' stroke-width='1.8' stroke-linecap='round'/%3E%3Cline x1='22' y1='60' x2='98' y2='60' stroke='%23ffffff' stroke-opacity='0.3' stroke-width='1.2' stroke-linecap='round'/%3E%3Cline x1='41' y1='79' x2='79' y2='41' stroke='%23ffffff' stroke-opacity='0.1' stroke-width='0.8' stroke-linecap='round'/%3E%3C/svg%3E"),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 120 120'%3E%3Ccircle cx='60' cy='60' r='3.6' fill='%23ffffff' fill-opacity='0.86'/%3E%3Cline x1='60' y1='20' x2='60' y2='100' stroke='%23ffffff' stroke-opacity='0.52' stroke-width='1.6' stroke-linecap='round'/%3E%3Cline x1='26' y1='60' x2='94' y2='60' stroke='%23ffffff' stroke-opacity='0.24' stroke-width='1' stroke-linecap='round'/%3E%3Cline x1='42' y1='42' x2='78' y2='78' stroke='%23ffffff' stroke-opacity='0.08' stroke-width='0.7' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-size: 34px 34px, 30px 30px, 26px 26px, 32px 32px, 28px 28px, 24px 24px;
  background-position: 14% 20%, 72% 31%, 84% 74%, 31% 58%, 57% 16%, 90% 52%;
}
body > * { position: relative; z-index: 1; }
button, input, textarea, select { font: inherit; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { max-width: var(--max); margin: 0 auto; padding: 24px; }
.video-page .container { max-width: min(1640px, calc(100vw - 24px)); }
.topbar { background: #111111; border-bottom: 1px solid var(--border); }
.topbar-inner { max-width: var(--max); margin: 0 auto; padding: 16px 24px; display: flex; justify-content: space-between; gap: 18px; align-items: center; }
.video-page .topbar-inner { max-width: min(1640px, calc(100vw - 24px)); }
.brand { font-weight: 700; font-size: 1.2rem; }
.nav { display: flex; gap: 18px; color: var(--muted); }
.hero { padding: 9px 0 3px; }
.hero-box { display: flex; justify-content: center; align-items: center; padding: 0; background: transparent; border: 0; border-radius: 0; box-shadow: none; overflow: visible; }
.hero-logo { width: min(100%, 1080px); height: auto; margin: clamp(-80px, -7vw, -18px) 0; }
.hero-box h1 { margin: 0 0 12px; font-size: 2.3rem; }
.hero-box p { margin: 0; max-width: 760px; line-height: 1.5; color: rgba(255,255,255,0.94); }
.badges { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.badge { background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.14); padding: 8px 12px; border-radius: 999px; font-size: 0.95rem; }
.section-head { display: flex; justify-content: space-between; align-items: end; gap: 16px; margin: 26px 0 12px; }
.section-head h2 { margin: 0; }
.section-head p { margin: 6px 0 0; color: var(--muted); }
.card-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.playlist-card, .video-panel, .playlist-panel { background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; }
.playlist-card { display: flex; flex-direction: column; height: 100%; }
.playlist-card-content, .video-panel, .playlist-panel { padding: 16px; }
.playlist-card-content { display: flex; flex-direction: column; flex: 1; }
.playlist-card-head { display: flex; align-items: baseline; justify-content: space-between; gap: 14px; }
.playlist-card-head h3 { margin: 0; }
.playlist-count { margin-left: auto; white-space: nowrap; background: #343434; padding: 6px 10px; border-radius: 999px; border: 1px solid var(--border); font-size: 0.95rem; color: var(--muted); }
.card-thumb-frame { padding: 12px; background: var(--card); }
.card-thumb { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; border-radius: 14px; }
.muted { color: var(--muted); line-height: 1.45; }
.link-btn, .ghost-btn, button.link-btn, button.ghost-btn {
  display: inline-block; padding: 11px 15px; border-radius: 12px; margin-top: 12px;
  font-weight: 700; border: 0; cursor: pointer; font-size: 1rem;
}
.link-btn, button.link-btn { background: #ff5f00; color: #fff7f2; }
.playlist-card .link-btn { background: var(--card-accent, #ff5f00); color: var(--card-accent-text, #fff7f2); margin-top: auto; align-self: flex-start; }
.ghost-btn, button.ghost-btn { background: #3a2418; color: #ffb78d; border: 1px solid rgba(255,95,0,0.35); }
.video-page #prevBtn.ghost-btn { background: #202a31; color: #d8edf5; border: 1px solid rgba(136,186,212,0.28); }
.video-page #nextBtn.link-btn { background: #24546a; color: #f3fcff; }
.stats { display: flex; gap: 10px; flex-wrap: wrap; color: var(--muted); font-size: 0.95rem; margin-top: 12px; align-items: center; }
.stats span { background: #343434; padding: 6px 10px; border-radius: 999px; border: 1px solid var(--border); }
.breadcrumbs {
  font-size: var(--lesson-title-size);
  line-height: var(--lesson-title-line-height);
  color: var(--muted);
  margin: 20px 0 8px;
}
.breadcrumbs a { color: inherit; }
.video-layout { display: grid; grid-template-columns: minmax(0, 2fr) 400px; gap: 20px; align-items: start; }
.video-page .video-layout { grid-template-columns: minmax(0, 1fr) clamp(420px, 28vw, 480px); }
.single-video-layout {
  max-width: min(1120px, 100%);
  margin: 0 auto;
}
.player-shell {
  --player-accent-color: #8f4f27;
  --player-accent-text: #fff7f2;
  --player-soft-color: #3a2418;
  --player-soft-text: #ffcfb2;
  --player-soft-border: rgba(255,95,0,0.35);
  -webkit-tap-highlight-color: transparent;
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background:
    radial-gradient(circle at top, rgba(255,255,255,0.06), transparent 42%),
    linear-gradient(180deg, rgba(255,255,255,0.04), rgba(255,255,255,0)),
    #020202;
  border-radius: 18px;
  padding: 4px;
  overflow: hidden;
  box-shadow: 0 28px 70px rgba(0,0,0,0.34), inset 0 1px 0 rgba(255,255,255,0.08);
}
.player-shell.player-shell-interactive { cursor: pointer; }
.player { width: 100%; height: 100%; display: block; border: 0; border-radius: 10px; -webkit-tap-highlight-color: transparent; }
.player iframe { width: 100%; height: 100%; border: 0; display: block; border-radius: 10px; }
.player-nav-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: stretch;
  justify-content: center;
  padding: clamp(16px, 2.6vw, 28px);
  border-radius: 18px;
  pointer-events: none;
  opacity: 0;
  background:
    linear-gradient(180deg, rgba(2,5,8,0.02) 0%, rgba(2,5,8,0.04) 48%, rgba(2,5,8,0.46) 100%);
  transition: opacity 160ms ease, background-color 160ms ease;
  z-index: 2;
  -webkit-tap-highlight-color: transparent;
}
.player-shell.player-nav-visible .player-nav-overlay {
  opacity: 1;
  background:
    linear-gradient(180deg, rgba(2,5,8,0.03) 0%, rgba(2,5,8,0.08) 44%, rgba(2,5,8,0.56) 100%);
}
.player-floating-actions {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -56%);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  pointer-events: auto;
}
.player-controls-bar {
  width: min(640px, calc(100vw - 56px));
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 0;
  border: 0;
  background: none;
  box-shadow: none;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  pointer-events: auto;
  align-self: flex-end;
}
.player-progress-shell {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr) 48px;
  align-items: center;
  gap: 10px;
}
.player-time {
  font-variant-numeric: tabular-nums;
  font-size: 0.82rem;
  line-height: 1;
  color: rgba(236,244,250,0.88);
  text-align: center;
}
.player-progress-input {
  --progress-percent: 0%;
  width: 100%;
  height: 24px;
  margin: 0;
  appearance: none;
  -webkit-appearance: none;
  background: transparent;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
.player-progress-input:focus-visible {
  outline: none;
}
.player-progress-input::-webkit-slider-runnable-track {
  height: 8px;
  border-radius: 999px;
  background:
    linear-gradient(90deg, color-mix(in srgb, var(--player-accent-color) 34%, rgba(255,255,255,0.46)) 0%, color-mix(in srgb, var(--player-accent-color) 34%, rgba(255,255,255,0.46)) var(--progress-percent), rgba(255,255,255,0.16) var(--progress-percent), rgba(255,255,255,0.16) 100%);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.12);
}
.player-progress-input::-moz-range-track {
  height: 8px;
  border: 0;
  border-radius: 999px;
  background: rgba(255,255,255,0.16);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.12);
}
.player-progress-input::-moz-range-progress {
  height: 8px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--player-accent-color) 34%, rgba(255,255,255,0.46));
}
.player-progress-input::-webkit-slider-thumb {
  width: 16px;
  height: 16px;
  margin-top: -4px;
  border: 0;
  border-radius: 999px;
  appearance: none;
  -webkit-appearance: none;
  background:
    radial-gradient(circle at 35% 35%, rgba(255,255,255,0.95), rgba(255,255,255,0.64) 48%, rgba(255,255,255,0.22) 100%),
    color-mix(in srgb, var(--player-accent-color) 62%, #fff);
  box-shadow: 0 4px 14px rgba(0,0,0,0.24);
}
.player-progress-input::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border: 0;
  border-radius: 999px;
  background:
    radial-gradient(circle at 35% 35%, rgba(255,255,255,0.95), rgba(255,255,255,0.64) 48%, rgba(255,255,255,0.22) 100%),
    color-mix(in srgb, var(--player-accent-color) 62%, #fff);
  box-shadow: 0 4px 14px rgba(0,0,0,0.24);
}
.player-nav-btn {
  width: 42px;
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 1px solid rgba(255,255,255,0.22);
  border-radius: 999px;
  background:
    linear-gradient(180deg, rgba(255,255,255,0.16), rgba(255,255,255,0.02)),
    rgba(14,19,24,0.28);
  color: rgba(245,250,255,0.98);
  box-shadow:
    0 12px 22px rgba(0,0,0,0.2),
    inset 0 1px 0 rgba(255,255,255,0.14);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  opacity: 0.62;
  pointer-events: none;
  transition: transform 140ms ease, background-color 140ms ease, border-color 140ms ease, color 140ms ease, box-shadow 140ms ease, opacity 140ms ease;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}
.player-shell.player-nav-visible .player-nav-btn {
  pointer-events: auto;
}
.player-nav-btn-primary {
  width: 48px;
  height: 48px;
  border-color: color-mix(in srgb, var(--player-accent-color) 40%, rgba(255,255,255,0.24));
  background:
    linear-gradient(180deg, rgba(255,255,255,0.26), rgba(255,255,255,0.04)),
    color-mix(in srgb, var(--player-accent-color) 46%, rgba(16,22,28,0.4));
  color: var(--player-accent-text);
  box-shadow:
    0 16px 28px rgba(0,0,0,0.3),
    inset 0 1px 0 rgba(255,255,255,0.16),
    0 0 0 1px rgba(255,255,255,0.04),
    0 10px 28px color-mix(in srgb, var(--player-accent-color) 22%, transparent);
}
.player-floating-actions .player-nav-btn {
  border-color: rgba(255,255,255,0.16);
  background:
    linear-gradient(180deg, rgba(255,255,255,0.12), rgba(255,255,255,0.02)),
    rgba(10,14,18,0.2);
  box-shadow:
    0 12px 28px rgba(0,0,0,0.22),
    inset 0 1px 0 rgba(255,255,255,0.14);
}
.player-nav-btn#overlayPrevBtn,
.player-nav-btn#overlayFullscreenBtn {
  color: var(--player-soft-text);
  border-color: color-mix(in srgb, var(--player-soft-border) 72%, rgba(255,255,255,0.22));
  background:
    linear-gradient(180deg, rgba(255,255,255,0.16), rgba(255,255,255,0.02)),
    color-mix(in srgb, var(--player-soft-color) 34%, rgba(14,19,24,0.34));
}
.player-nav-btn#overlayNextBtn {
  color: var(--player-accent-text);
  border-color: color-mix(in srgb, var(--player-accent-color) 34%, rgba(255,255,255,0.22));
  background:
    linear-gradient(180deg, rgba(255,255,255,0.16), rgba(255,255,255,0.02)),
    color-mix(in srgb, var(--player-accent-color) 30%, rgba(14,19,24,0.34));
}
.player-nav-btn:disabled {
  opacity: 0.4;
  cursor: default;
}
.player-nav-btn:not(:disabled):hover,
.player-nav-btn:not(:disabled):focus-visible {
  opacity: 0.88;
  transform: translateY(-1px) scale(1.03);
  color: #fff;
  border-color: rgba(255,255,255,0.4);
  background:
    linear-gradient(180deg, rgba(255,255,255,0.22), rgba(255,255,255,0.04)),
    rgba(20,27,34,0.4);
  box-shadow:
    0 16px 30px rgba(0,0,0,0.32),
    inset 0 1px 0 rgba(255,255,255,0.18);
}
.player-nav-icon {
  width: 100%;
  height: 100%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  font-size: 1rem;
  line-height: 1;
  text-shadow: 0 1px 10px rgba(255,255,255,0.16);
}
.player-nav-svg {
  width: 18px;
  height: 18px;
  display: block;
}
.player-nav-svg path {
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.player-shell:fullscreen,
.player-shell:-webkit-full-screen {
  width: 100%;
  height: 100%;
  aspect-ratio: auto;
  background: var(--player-fullscreen-backdrop, #000);
  padding: 0;
  border-radius: 0;
  max-width: none;
  max-height: none;
}
.player-shell:fullscreen .player,
.player-shell:-webkit-full-screen .player,
.player-shell:fullscreen .player-nav-overlay,
.player-shell:-webkit-full-screen .player-nav-overlay {
  border-radius: 0;
}
.player-shell:fullscreen .player,
.player-shell:-webkit-full-screen .player {
  background: var(--player-fullscreen-backdrop, #000);
}
.player-shell:fullscreen .player-nav-overlay,
.player-shell:-webkit-full-screen .player-nav-overlay {
  inset: 0;
  transition: none;
}
.player-shell:fullscreen .player-floating-actions,
.player-shell:-webkit-full-screen .player-floating-actions {
  gap: 12px;
  transform: translate(-50%, -52%);
}
.player-shell:fullscreen::backdrop {
  background: var(--player-fullscreen-backdrop, #000);
}
@media (max-width: 640px) {
  .player-controls-bar {
    width: calc(100vw - 24px);
    padding: 10px 12px 12px;
    gap: 10px;
    border-radius: 20px;
  }
  .player-progress-shell {
    grid-template-columns: 42px minmax(0, 1fr) 42px;
    gap: 8px;
  }
  .player-floating-actions {
    gap: 8px;
    transform: translate(-50%, -58%);
  }
  .player-nav-btn {
    width: 38px;
    height: 38px;
  }
  .player-nav-btn-primary {
    width: 44px;
    height: 44px;
  }
}
.video-meta h1 { margin: 14px 0 10px; font-size: 1.45rem; line-height: 1.2; font-weight: 700; }
.note-box { margin-top: 14px; background: #333333; border: 1px solid var(--border); border-radius: 14px; padding: 14px; }
.video-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 14px;
}
.playlist-panel-head { margin-bottom: 14px; }
.playlist-panel-backdrop {
  position: relative;
  min-height: 150px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 8px;
  padding: 18px;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--border);
  background-color: #181818;
  background-image:
    linear-gradient(180deg, rgba(8, 8, 8, 0.08) 0%, rgba(8, 8, 8, 0.3) 36%, rgba(8, 8, 8, 0.82) 100%),
    var(--playlist-panel-thumb);
  background-size: cover;
  background-position: center;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.06);
}
.playlist-panel-title { margin: 0 0 10px; font-size: 1.3rem; line-height: 1.25; font-weight: 700; }
.playlist-panel-description { margin: 0; font-size: 1rem; line-height: 1.45; max-width: none; }
.playlist-scroll { display: flex; flex-direction: column; gap: 10px; max-height: 70vh; overflow-y: auto; padding-right: 2px; }
.playlist-video-item { display: grid; grid-template-columns: 92px 1fr; gap: 10px; padding: 10px; border-radius: 14px; border: 1px solid var(--border); align-items: start; }
.playlist-video-item.active { background: #3a3a3a; border-color: #6e6e6e; }
.playlist-video-thumb {
  width: 100%;
  aspect-ratio: 16 / 9;
  display: block;
  border-radius: 10px;
  object-fit: cover;
  background: #000;
  pointer-events: none;
}
.playlist-video-item .small { font-size: 1rem; line-height: 1.35; }
.small { font-size: 0.95rem; color: var(--muted); }
.footer { color: var(--muted); text-align: center; padding: 30px 24px 45px; }
@media (max-width: 1120px) {
  .video-layout,
  .video-page .video-layout { grid-template-columns: 1fr; }
  .playlist-video-item { grid-template-columns: 118px 1fr; }
}

@media (max-width: 900px) {
  .card-grid { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  body { font-size: 17px; }
  .container { padding: 18px 14px 22px; }
  .video-page .container { max-width: min(1640px, calc(100vw - 12px)); }
  .topbar-inner { padding: 12px 14px; }
  .video-page .topbar-inner { max-width: min(1640px, calc(100vw - 12px)); }
  .nav { gap: 12px; font-size: 0.95rem; }
  .hero { padding-top: 2px; }
  .hero-logo { margin: clamp(-20px, -4vw, -8px) 0; }
  .section-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    margin: 20px 0 10px;
  }
  .section-head p { margin-top: 0; }
  .card-thumb-frame { padding: 10px; }
  .playlist-card-content,
  .video-panel,
  .playlist-panel { padding: 14px; }
  .playlist-card-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
  .playlist-card-head h3 {
    font-size: 1.08rem;
    line-height: 1.25;
  }
  .playlist-count {
    margin-left: 0;
    font-size: 0.88rem;
  }
  .playlist-card .link-btn {
    width: auto;
    text-align: center;
    align-self: flex-start;
    font-size: 0.92rem;
  }
  .video-layout { gap: 16px; }
  .breadcrumbs {
    margin: 14px 0 10px;
    font-size: 0.92rem;
  }
  .video-meta h1 {
    margin-top: 12px;
    font-size: 1.2rem;
  }
  .stats {
    gap: 8px;
    font-size: 0.88rem;
  }
  .video-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    width: 100%;
  }
  .video-actions .ghost-btn,
  .video-actions .link-btn {
    width: 100%;
    margin-top: 0;
    text-align: center;
  }
  .playlist-panel-head { margin-bottom: 12px; }
  .playlist-panel-backdrop {
    min-height: 124px;
    padding: 14px;
  }
  .playlist-panel-title {
    margin-bottom: 6px;
    font-size: 1.12rem;
  }
  .playlist-panel-description {
    font-size: 0.95rem;
  }
  .playlist-scroll {
    gap: 8px;
    max-height: none;
    overflow: visible;
    padding-right: 0;
  }
  .playlist-video-item {
    grid-template-columns: 88px 1fr;
    gap: 10px;
    padding: 9px;
  }
  .playlist-video-item .small { font-size: 0.9rem; }
  .playlist-video-title { font-size: 0.92rem; }
  .footer {
    padding: 24px 16px 34px;
    font-size: 0.92rem;
  }
}

@media (max-width: 560px) {
  body { font-size: 16px; }
  .container { padding: 16px 12px 20px; }
  .video-page .container { max-width: min(1640px, calc(100vw - 8px)); }
  .topbar-inner { padding: 10px 12px; }
  .video-page .topbar-inner { max-width: min(1640px, calc(100vw - 8px)); }
  .hero-logo { margin: clamp(-12px, -3vw, -4px) 0; }
  .hero-box h1 { font-size: 1.8rem; }
  .playlist-card-head h3 {
    font-size: 1rem;
    line-height: 1.2;
  }
  .playlist-card .link-btn { font-size: 0.88rem; }
  .playlist-card-content,
  .video-panel,
  .playlist-panel { padding: 12px; }
  .link-btn,
  .ghost-btn,
  button.link-btn,
  button.ghost-btn {
    padding: 10px 14px;
    font-size: 0.95rem;
  }
  .video-actions { grid-template-columns: 1fr; }
  .player-nav-overlay { padding: 10px; }
  .player-controls-bar { width: calc(100% - 4px); }
  .player-progress-shell {
    grid-template-columns: 40px minmax(0, 1fr) 40px;
    gap: 6px;
  }
  .player-time { font-size: 0.75rem; }
  .player-nav-btn {
    width: 34px;
    height: 34px;
  }
  .player-nav-btn-primary {
    width: 40px;
    height: 40px;
  }
  .player-nav-svg {
    width: 16px;
    height: 16px;
  }
  .video-meta h1 { font-size: 1.08rem; }
  .playlist-video-item {
    grid-template-columns: 80px 1fr;
    padding: 8px;
  }
  .playlist-panel-backdrop { min-height: 108px; }
  .playlist-panel-title { font-size: 1rem; }
  .playlist-panel-description { font-size: 0.9rem; }
  .playlist-video-title { font-size: 0.88rem; }
}
.playlist-video-title {
  font-size: var(--lesson-title-size);
  line-height: var(--lesson-title-line-height);
  font-weight: var(--lesson-title-weight);
}